Casio GB-6900B User's Manual For Watch Functions page 74

Initial Battery
•
The battery that comes loaded in your watch when you purchase it is used for
function and performance testing at the factory.
•
This type of test battery may go dead quicker than the normally rated battery life
as noted in the User's Guide. Note that you will be charged for replacement of this
battery, even if replacement is required within the watch's warranty period.
Low Battery Power
•
Low battery power is indicated by large timekeeping error, when display contents
are dim, or when the display does blank.
•
Operation while battery power is low can result in malfunction. Replace the battery
as soon as possible.
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